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Gas chromatography of thermoliable substance or trace-target-containing substance

A technology for gas chromatography analysis and target substances, which is applied in the direction of analyzing materials, measuring devices, and material separation. It can solve the problems of lowering and lowering the temperature of the injection port, and achieve increased injection volume, reduced decomposition, and reduced shunt discrimination. Effect

Inactive Publication Date: 2019-01-15
DONGYING HI TECH SPRING CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the most obvious change is that the amount not participating in the reaction decreases as the temperature decreases, which fully shows that the sample is decomposed in the vaporization chamber, but in order to ensure that the sample is completely vaporized, the temperature of the injection port cannot be lowered.

Method used

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  • Gas chromatography of thermoliable substance or trace-target-containing substance
  • Gas chromatography of thermoliable substance or trace-target-containing substance
  • Gas chromatography of thermoliable substance or trace-target-containing substance

Examples

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Embodiment 1

[0035] Analytical sample: the distillation outlet of the source production device, name: propylene carbonate (PC), this sample is a typical organic compound that is easily decomposed by heating, and it contains propylene oxide (PO) and carbon dioxide (CO 2 )synthesis. Decomposition will occur at high temperature, and the decomposition products are propylene oxide and carbon dioxide. Process theoretical value: PC≥99.99%, PO≤0.0030%, the sample composition contains both high-purity substance PC and trace impurity PO.

[0036]Analysis method: instrument (Agilent 7890B), FID detector, chromatographic column: Agilent, HP-INNOWAX / 19095N-213, detector temperature 270°C, column oven temperature: programmed temperature rise: initial temperature 100°C, keep for 2min, then increase for 10 The temperature was raised to 120°C at a rate of ℃ / min, and immediately raised to 200°C at 20°C / min without stopping, and kept for 5 minutes; the temperature of the injection port was 250°C, the pressu...

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Abstract

The invention provides a gas chromatography of a thermoliable substance or a trace-target-containing substance. The method comprises the following steps: performing gas chromatography on a to-be-tested sample by adopting pulse sampling, wherein the to-be-tested sample comprises the thermoliable substance or the trace-target-containing substance. Compared with the prior art, the pressure is increased in the sampling process by adopting pulse sampling, the sample quickly enters a chromatographic column, the decomposition of the thermoliable substance in a vaporizing chamber when performing the gas chromatography is greatly reduced, and the sampling amount can be enlarged, the split discrimination is reduced, and liner tube overload risk is lowered. The method provided by the invention is especially suitable for the analysis of high-purity substance and trace target substance, and the accuracy and the reliability of the analysis are improved.

Description

technical field [0001] The invention belongs to the technical field of gas chromatographic analysis, and in particular relates to a gas chromatographic analysis method for easily decomposed substances and trace target substances. Background technique [0002] Gas chromatography is a chromatographic separation analysis method that uses gas as the mobile phase. The vaporized sample is brought into the chromatographic column by the carrier gas (mobile phase). The stationary phase in the column has different molecular forces with the components in the sample. The time for each component to flow out of the chromatographic column is different, and the components are separated from each other. [0003] According to the requirements of the gas chromatograph on the temperature of the vaporization chamber, the temperature of the injection port is set 30°C higher than that of the substance with the highest boiling point in the analysis sample at the beginning, but there will always be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 王玉霞燕增伟王春梅滕文彬
Owner DONGYING HI TECH SPRING CHEM IND
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